401(k) · DOL Form 5500 · 2022
Board of Trustees of Supplemental Income Trust Fund 401(k) Plan
Data updated 2026-08-25
- $1.4B
- Total assets Very large vs avg
- 28,894
- Participants Very large workforce
- 99th
- Percentile by assets National rank
- $49,220
- Avg per participant Low balance/head
Official DOL plan name: Supplemental Income 401(k) Plan · Sponsored by Board of Trustees of Supplemental Income Trust Fund · California · Transportation & Warehousing
$1.4B in assets, 28,894 participants
Board of Trustees of Supplemental Income Trust Fund's Supplemental Income 401(k) Plan reported $1.4B in total assets and 28,894 participants in its 2022 DOL Form 5500 filing, ranking in the 99th percentile by assets among filed plans. Figures are as reported by the plan sponsor to the Department of Labor, not audited or endorsed by PlainRetire.
- #3,823 in Transportation & Warehousing (3,876 peers)
Coverage in California
Supplemental Income 401(k) Plan covers 28,894 participants in California, 46x the typical California plan (state average ~630 per filing). Assets: $1.4B.
- #3,823
- in Transportation & Warehousing (3,876 peers)
- -14.9%
- assets change YoY
- 14×
- vs typical plan assets (national mean)
The plan reported a net loss of $249M for the year, a single-year figure driven by markets and benefit payments, not a measure of plan health.
Supplemental Income 401(k) Plan's outsized position by total assets
Supplemental Income 401(k) Plan vs every filed plan by assets
End-of-year total assets · plan year 2022 · DOL Form 5500
$1,422,154,284 Top 1% higher than 99% of 139,123 filed plans
Dashed line + filled bar = this entry, among filed plans.
Source U.S. Department of Labor Form 5500 filings (EBSA) · plan year 2022
Supplemental Income 401(k) Plan's mega-plan peer group by participant headcount
Plan-year 2022 Form 5500 filings with a reported participant count, partitioned by headcount band, not by assets. Supplemental Income 401(k) Plan is a mega filing (28,894 participants), the rightmost band on the breakdown.
Published 5500 schedule card
Filing strip 942554388 · Board of Trustees of Supplemental Income Trust Fund PY 2022 · 401(k)
Supplemental Income 401(k) Plan · $1.4B · 28,894 · 99th
- EIN $1.4B
- EIN 28,894
- EIN 99th
- EIN 401(k)
- EIN near General Dynamics Corporation 401(k) Plan 3.0
- EIN ind #3823
Stamps derive from this plan's Form 5500 line items (assets, participants, type, EIN, cohort placement) - not a quality rating of the sponsor. Read with Transportation & Warehousing retirement plans → · Plans in California →
Supplemental Income 401(k) Plan in the asset neighbourhood
California filing particulars
| Total Assets (Beginning of Year) | $1.7B |
|---|---|
| Net Assets (End of Year) | $1.4B |
| Net Income | -$249M |
| Employer EIN | 942554388 |
| Plan Effective Date | 1995-01-01 |
| Filing Status | FILING RECEIVED |
Sponsor Plan History (Board of Trustees of Supplemental Income Trust Fund)
Sponsor-wide plan assets over time
All Board of Trustees of Supplemental Income Trust Fund plans reported in each filing year
- Latest sponsor-wide plan assets
- $1.9B 31.22148391320389% vs 2022
- 2024 filing year
| Year | Plans | Participants | Total Assets |
|---|---|---|---|
| 2022 | 1 | 28,894 | $1.4B |
| 2023 | 1 | 30,285 | $1.7B |
| 2024 | 1 | 32,778 | $1.9B |
Nearby 401(k) Plans in California
Peer 401(k) plans, same state, same plan type, ranked by total assets.
- Wells Fargo & Company 401(k) Plan $45.8B · 205,865
- Google LLC 401(k) Savings Plan $28.9B · 102,963
- Oracle Corporation 401(k) Savings and Investment Plan $21.9B · 46,320
- Chevron Employee Savings Investment Plan $18.6B · 19,946
- Intel 401(k) Savings Plan $18.4B · 54,672
Scale composition for Supplemental Income 401(k) Plan
Supplemental Income 401(k) Plan reports $1.4B in end-of-year assets across 28,894 participants (0.012% of the $12.3T held by all Form 5500 filers in the national rollup , and 0.031% of 93,925,755 covered participants) - about $49,220 per participant (36% of the national average assets-per-participant) . Net income for plan year 2022 was -$249M.
This plan identity (EIN 942554388, plan #002) has 3 Form 5500 filings on file from 2022 to 2024 , with end-of-year assets moving from $1.4B to $1.9B (+31.2%) while covered participants moved from 28,894 to 32,778 . Single-year sparse filers cannot show that trail.
| Plan year | Participants | EOY assets | Filing |
|---|---|---|---|
| 2022 | 28,894 | $1.4B | This page |
| 2023 | 30,285 | $1.7B | Open filing |
| 2024 · index core | 32,778 | $1.9B | Open filing |
The same sponsor also keeps 1 other index-core plan on PlainRetire:
- Supplemental Income 401(k) Plan (401(k), $1.9B, 32,778 participants)
Supplemental Income 401(k) Plan's out-of-state 401(k) peers by assets and headcount
Outside California, the nearest 401(k) by assets is General Dynamics Corporation 401(k) Plan 3.0 in VA ($1.4B); by covered participants it is Casey's General Stores 401(k) Plan in IA (28,900 participants). Same-state nearby plans are listed separately above.
Closest by plan assets
Nearest other-state filings by tot_assets_eoy ($1.4B here).
- General Dynamics Corporation 401(k) Plan 3.0 (VA) $1.4B · 1,886
- Sidley Austin LLP Savings and Investment Plan (IL) $1.4B · 3,100
- Wesco Distribution, Inc. Retirement Savings Plan (PA) $1.4B · 6,235
- Profit Participation Plan of Moody's Corporation (NY) $1.4B · 4,723
Similar participant headcount
Nearest other-state filings by covered participants (28,894 participants); asset peers above are excluded.
- Casey's General Stores 401(k) Plan (IA) 28,900 · 6 off
- Trinet Select 401(k) Plan (FL) 28,864 · 30 off
- Sally Beauty 401(k) and Profit Sharing Plan (TX) 28,960 · 66 off
- Union Pacific Agreement Employee 401(k) Retirement Thrift Plan (NE) 28,974 · 80 off
DOL Form 5500 plan year 2022. Asset totals can differ widely at the same headcount; neither axis is a quality rating.